<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"> 
<title>菜鸟教程(runoob.com)</title> <!--演示了如何增加或减少字符之间的空间-->
<style>
h1 {letter-spacing:2px;}/*设置字符间距*/
h2 {letter-spacing:-3px;}
</style>
</head>

<body>
<h1>This is heading 1</h1>
<h2>This is heading 2</h2>
</body>
</html>